摘要
[目的]揭示土壤动物在喀斯特森林凋落物分解中的作用,深入认识喀斯特生态脆弱区植物-土壤系统养分的循环过程。[方法]采用凋落物袋法,以贵州中部地区喀斯特森林优势木本和草本植物凋落物(白茅、圆果化香树和翅荚香槐)为研究对象,进行持续1年的原位分解,通过排序分析、随机森林模型等多元统计分析方法,探究不同体型土壤动物群落对森林凋落物分解的影响。[结果]不同处理间凋落物质量损失率差异显著,草本植物凋落物白茅质量损失率最高,木本植物凋落物翅荚香槐损失率最低。一定范围内,凋落物质量损失率与碳氮比成反比。土壤动物平均增加了24.89%的凋落物分解,中小型土壤动物作用(15.34%)大于大型土壤动物作用(9.55%);土壤动物对凋落物分解的贡献率在分解前期较后期大。从凋落物袋中共捕获土壤动物13733头,分属21个类群,优势类群为蜱螨目和弹尾目;随机森林模型结果显示,前气门亚目、长角䖴目、短角䖴目、伪蝎目、中气门亚目、蚁甲科在凋落物分解中起到关键性作用。[结论]除草本植物外,黔中喀斯特森林凋落物分解速率与碳氮比成反比。土壤动物在凋落物的分解中具有重要作用,且在分解前期贡献较大。
[Objective]To reveal the role of soil fauna on litter decomposition in karst forests and understand deeply the nutrients recycling in the plant-soil system in the ecologically fragile karst region.[Method]A one-year field litterbag experiment with local dominant herbaceous and woody species litter,i.e.,Imperata cylindrica(IC),Platycarya longipes(PL),and Cladrastis platycarpa(CP),was carried out to study the influence of soil fauna with different body sizes on litter decomposition through ordination analysis and random forest model.[Result]Results showed that litter mass loss rate differed significantly among litter treatments.The highest and lowest mass loss rate was recorded by herbaceous litter(IC)and woody litter(CP),respectively.Litter mass loss rate was negatively correlated with litter C/N values.On average,soil fauna contributed 24.89%to forest litter decomposition,of which the contribution rate of meso-,and micro-fauna to litter decomposition was 15.34%,higher than that of macrofauna(9.55%),Soil fauna mainly contributed to litter mass loss in the early stage of decomposition.A total of 13733 individuals of soil fauna which belonged to 21 groups were captured in litterbags.Acarina and Collembola were the dominant groups.Prostigmata,Entomobryomorpha,Neelipleona,Pseudoscorpiones,Mesostigmata,and Pselaphidae played a vital role in litter decomposition through random forest model.[Conclusion]In the central Guizhou karst forest,litter mass loss rate is negatively correlated with litter C/N values,except herbaceous litter.Soil fauna has a positive effect on litter decomposition,especially in the early stage of decomposition.
作者
邓承佳
袁访
卜通达
梁红
宋理洪
DENG Cheng-jia;YUAN Fang;BU Tong-da;LIANG Hong;SONG Li-hong(College of Agriculture,Guizhou University,Guiyang,550025,Guizhou,China)
出处
《林业科学研究》
CSCD
北大核心
2022年第3期72-81,共10页
Forest Research
基金
国家自然科学基金(41807055)
贵州省科技厅项目(黔科合后补助[2020]3001)。
关键词
凋落物
土壤动物
分解特征
土壤动物贡献率
喀斯特森林
litter
soil fauna
decomposition characteristics
contribution of soil fauna
karst forest
